A 20-year-old US student who was shot in the shoulder decided to post a smiling selfie with the bleeding gunshot wound on social media rather than calling for medical help, NDTV reports.

Arizona-based restaurant worker Isaac Martinez was shot during the deadly Arizona rampage this week.

Instead of calling 911, the first thing he did was reach for his smartphone and post a bloody selfie on social media app Snapchat, Mirror.co.uk reported.

The selfie-savvy college student did not just stop there and continued updating his harrowing ordeal online as he was being taken to the hospital, posting a series of bloody selfies.

Once in the hospital, he shared another selfie which showed him lying in bed bare-chested with a white dressing on his bloodied shoulder.

A friend even turned one of his hospital snapshots into a meme, showing Martinez with a painted-on cigarette and dark sunglasses along with the caption that read "Thug Life".

After being released from the hospital, Martinez again updated his condition, saying that the bullet struck him from behind and exited out of his collar area.

"I was the only one injured. Everyone else was unharmed. Overall, I'm glad it went the way it did rather than any other way," the 20-year-old posted.

Police have arrested Ryan Giroux, 41, who is suspected of killing a man and injuring five others, including Martinez during the rampage.

Martinez was on his way to the eatery where he works part-time when Giroux allegedly confronted him in the parking lot and demanded his car, the report added.